ABYSS aims to be a fully HTTP/1.1 compliant Web server. Its main design goals are speed, low resource usage, and portability. ABYSS works on most UNIX based systems and on Win32 systems (Win95/98/2000/NT/XP).

Addns.pl is a self-contained DynDNS update client for DynDNS.org (and possibly others). It supports a variety of IP detection methods including external webcheck/router pages. It also supports multiple configurations and hostnames, smart abuse prevention, and custom/static/dynamic DNS, and can run as a daemon, commandline options only, or with a configuration file.

ADODB is a set of advanced PHP database
abstraction classes. It supports MySQL,
PostgreSQL, Interbase/Firebird, Informix, Sybase
SQL Anywhere, Oracle, MS SQL 7 and 2000, SAP DB,
Sybase, DB2, FrontBase, Foxpro, Access, Netezza,
LDAP, ODBTP, ADO, and generic ODBC. A metatype
system is built in, making it possible to figure
out that types such as CHAR, TEXT, and STRING are
equivalent in different databases. It also
features portable database creation,
database-backed session support (with encryption),
SQL performance monitoring, and database health
checks.

AES Encryption for Shell Scripts provides strong encryption/decryption using the Advanced Encryption Standard algorithm "Rijndael" to do 128-bit encryption. It is intended for use in shell scripts or as part of a larger cryptosystem, not as a standalone program.

AGT is a powerful console frontend to iptables,
supporting nearly all of the iptables extensions
(such as quota, random, MIRROR, multiport, owner,
string, MAC address, and more). All options can be
specified in a configuration file with similar
syntax to 'ipf' and 'ipfw'.

Alt+Connect manages dialup connections, allowing a group of networked machines to share a single Internet connection through their server. Custom client software lets users to start or stop their internet connection, and the server (connectd) ensures that the connection remains up only while someone's using it. Features include support for multiple ISPs and links (modems or ISDN channels), connection control lists, ability to record the time a user spends online and charge him for it, and the ability to enable and disable IP forwarding as a machine starts or stops using the Internet.

am-utils is the next generation of the popular BSD automounter, amd. It includes many additional updates, ports, programs, features (such as NFS V.3 support, and shared libraries), Autofs, bug fixes, and more.

Amaya is a complete Web browsing and authoring environment, and comes equipped with a WYSIWYG style interface. It lets users both browse and author valid Web pages, with standards including (X)HTML, native MathML, and SVG documents. It also includes a collaborative annotation application (RDF).

amx takes a mailbox file and removes any messages which were received more than a given number of days ago. It also makes other configurable checks on the headers so you can ensure that unread messages or ones flagged as important can be kept.